You can't call it lying when words have to meaning

McCain's against privatizing social security, but wants to let younger workers divert a portion of their payroll taxes to private accounts.

Chirp.

Chirp.

In other words, privatizing social security.

A good idea from one of Matt's commenters:

It seems to me that McCain's greatest vulnerability might be the existence of 'Two McCains'. I don't think an Obama ad needs to do much more than play the many clips of McCain dueling McCain on policy. It simultaneously raises doubts among independents and Republicans.